Provide a SessionHelper to manage the session

src/main/java/com/commafeed/frontend/SessionHelperProvider.java

@@ -0,0 +1,44 @@
+package com.commafeed.frontend;
+
+import java.lang.reflect.Type;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.ext.Provider;
+
+import com.sun.jersey.core.spi.component.ComponentContext;
+import com.sun.jersey.core.spi.component.ComponentScope;
+import com.sun.jersey.spi.inject.Injectable;
+import com.sun.jersey.spi.inject.InjectableProvider;
+
+@Provider
+public class SessionHelperProvider implements InjectableProvider<Context, Type> {
+	
+    private final ThreadLocal<HttpServletRequest> request;
+
+    public SessionHelperProvider(@Context ThreadLocal<HttpServletRequest> request) {
+        this.request = request;
+    }
+
+    @Override
+    public ComponentScope getScope() {
+        return ComponentScope.PerRequest;
+    }
+
+    @Override
+    public Injectable<?> getInjectable(ComponentContext ic, final Context session, Type type) {
+        if (type.equals(SessionHelper.class)) {
+            return new Injectable<SessionHelper>() {
+                @Override
+                public SessionHelper getValue() {
+                    final HttpServletRequest req = request.get();
+                    if (req != null) {
+                        return new SessionHelper(req);
+                    }
+                    return null;
+                }
+            };
+        }
+        return null;
+    }
+}